Uploading PDF file from own computer: Where Did it Go?

Hi,
I have a file sent to me by a doctor which is his PDF study published in British Medical Journal which I’m trying to upload or link to a post I’m drafting. He sent me the full text and the BMJ only gives an abstract.

I went into Media, upload files from computer–and then went to the updated version and Word Press showed that it had uploaded it somewhere but I can’t find it. The link doesn’t activate and I don’t see any reference to the study.